XMNR: Gearbox Software revealed that the fourth DLC for Borderlands 2 is currently in the works during a panel at PAX East on Sunday. The new DLC should arrive some time in June.
via N4G: pc news feed http://n4g.com/news/1216179/borderlands-2-fourth-dlc-coming-this-summer
via N4G: pc news feed http://n4g.com/news/1216179/borderlands-2-fourth-dlc-coming-this-summer